Permanent storage of the numbers in the blacklist even power is off or telephone line is plugged out.

One-touch blacklist function.very easy to operate even without manual. Better set the call blocker in-line (connected directly to phone, then to phone line). Though it also can be set up parallel with the phone to work, but some phone systems doesnt work.

Block up to 1,500 individual phone numbers ( including incoming and outgoing calls ), prefixes and up to 10 area codes.

This is the latest version Telephone Call Blocker with hidden or unavailable call numbers can be blocked. And there is no fees to use it. Manual also have been updated to a improved one with better English directed.

BATTERY OPERATED: This incoming call blocker device is powered by your phone line but uses 3 AAA batteries as backup (not included). To install or replace the batteries, open the battery cover located in the back of the unit and insert the batteries

EASY INSTALLATION: Features hassle-free plug-in installation. Just connect your phone line to the "LINE" port coming from wall or your phone service provider and then use small cord to connect "PHONE" port or socket directly to the actual phone set

UP TO 1500 CONTACTS: The landline blocker system is FSK/DTMF compatible allowing you to whitelist up to 1500 contacts, blacklist up to 1500 contacts, incoming call up to 100 contacts, outgoing call up to 50 contacts or block up to 20 area codes